High-barrier degradable biaxially oriented film and preparation method thereof

Abstract

The invention discloses a high-barrier degradable biaxially oriented film and a preparation method thereof. The film is of a five-layer structure and sequentially comprises an upper surface layer, a first secondary surface layer, a middle layer, a second secondary surface layer and a lower surface layer from top to bottom, wherein the upper surface layer comprises polylactic acid, a compatilizer, functional masterbatch and polybutylene terephthalate / adipate, the first secondary surface layer comprises polycaprolactone, cellulose and starch, the middle layer comprises poly-3-hydroxybutyrate, a compatilizer and a carbon dioxide epoxypropane copolymer, the second secondary surface layer comprises polycaprolactone, cellulose and starch, and the lower surface layer comprises polylactic acid, a compatilizer, functional master batch and polybutylene succinate. The film prepared through the method is good in mechanical property, high in barrier property and completely biodegradable, and the product is suitable for the field of packaging of food, medicine, daily chemical products, medical instruments and the like.

Description

technical field [0001] The invention belongs to the technical field of film flexible packaging, and in particular relates to a high-barrier degradable biaxially stretched film and a preparation method thereof. Background technique [0002] The use of plastic packaging products has brought great convenience to people's lives and has become an indispensable packaging material for human survival and social development. However, the disposal of waste plastic packaging products is a headache. Due to the non-degradability of waste plastic products, they can only be incinerated or landfilled, but the incineration process will produce a large amount of harmful gases, and landfill will occupy a large amount of land, affecting crop cultivation, and the occupied land will not be restored for a long time , affecting the sustainable use of land. With the increasing use of plastic packaging products year by year, the problem of environmental pollution is becoming more and more prominent....

AI Technical Summary

Problems solved by technology

However, this kind of film is not truly degradable. When the starch component is degraded, PET fragments that cannot be degraded will still be left, causing damage to the environment, and the addition of starch in the blending method will cause a decline in the mechanical properties and barrier properties of the film.

Another example is the Chinese patent application "antistatic degradable film material and its preparation method" with the publication number CN101717533A, which mentions a kind of antistatic degradable film material and its preparation method, using low density polyethylene, linear low density polyethylene, Films prepared from starch-based degradable plastic materials and antistatic masterbatches have good antistatic effects and excellent mechanical properties, but this film material can only be partially degraded (that is, the starch component in the film, and other material components after starch degradation. Disintegrated into countless small fragments, but it is still not degradable), there is still a great impact on the environment

Images